Re: [PATCH v6 15/16] PCI/AER: Add ratelimits to PCI AER Documentation
From: Sathyanarayanan Kuppuswamy <sathyanarayanan.kuppuswamy@linux.intel.com>
Date: 2025-05-20 05:01:16
Also in:
linux-pci, lkml
On 5/19/25 2:35 PM, Bjorn Helgaas wrote:
quoted hunk ↗ jump to hunk
From: Jon Pan-Doh <redacted> Add ratelimits section for rationale and defaults. Signed-off-by: Karolina Stolarek <redacted> Signed-off-by: Jon Pan-Doh <redacted> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> Acked-by: Paul E. McKenney <paulmck@kernel.org> --- Documentation/PCI/pcieaer-howto.rst | 11 +++++++++++ 1 file changed, 11 insertions(+)diff --git a/Documentation/PCI/pcieaer-howto.rst b/Documentation/PCI/pcieaer-howto.rst index f013f3b27c82..896d2a232a90 100644 --- a/Documentation/PCI/pcieaer-howto.rst +++ b/Documentation/PCI/pcieaer-howto.rst@@ -85,6 +85,17 @@ In the example, 'Requester ID' means the ID of the device that sent the error message to the Root Port. Please refer to PCIe specs for other fields. +AER Ratelimits +-------------- + +Since error messages can be generated for each transaction, we may see +large volumes of errors reported. To prevent spammy devices from flooding +the console/stalling execution, messages are throttled by device and error +type (correctable vs. uncorrectable).
Can we list exceptions like DPC and FATAL errors (if added) ?
+ +AER uses the default ratelimit of DEFAULT_RATELIMIT_BURST (10 events) over +DEFAULT_RATELIMIT_INTERVAL (5 seconds). + AER Statistics / Counters -------------------------
-- Sathyanarayanan Kuppuswamy Linux Kernel Developer